Combined rock and core drill



1963 M. B. SALISBURY ETAL 3,

COMBINED ROCK AND CORE DRILL Filed Sept. 14, 1960 3 Sheets-Sheet 1 Maurice B. Sal/19M Ell/s ry Lorin L.

IN VENTORS t a Mal/(ice 8. 5005110,,

H Lorin q iENTORs 1963 M. B. SALISBURY ETAL 3,113,626

COMBINED ROCK AND CORE DRILL Filed Sept. 14. 1960 3 Sheets-Sheet 2 1963 M. B. SALISBURY ETAL 3,113,626

COMBINED ROCK AND CORE DRILL Filed Sept. 14, 1960 3 Sheets-Sheet 3 Fig.3 Z6

Maurice Salisbury Lorin L. Ell/ls INVENTOM United States Patent O 3,113,626 COMBINED ROCK AND CORE DRILL Maurice B. Salisbury and Lorin L. Ellis, both of 114 Quincy, Topeka, Kans. Filed Sept. 14, 196i), Ser- No. 55,930 2 Claims. (Cl. 17327) The present invention relates to drilling apparatus especially useful for the drilling of holes in concrete pavement in connection with mud-jacking.

The drilling apparatus of this invention is concerned with the drilling of holes in concrete for the purpose of correcting the settlement of concrete pavement. As is well known to those skilled in the art, concrete pavements are often placed upon fills which subsequently settle causing cavities to develop under the pavement and causing the pavement to sag. Such settled concrete pavements are customarily restored to proper position by boring of holes through the pavement and packing mud therethrough beneath the pavement in order to raise and restore its level position. Accordingly, the holes so drilled through the concrete for such purpose are subsequently refilled or plugged with concrete. Ordinarily the holes drilled for the purpose hereinabove indicated are made by use of a pneumatic rock drill. The conventional type of pneumatic rock drill however creates a ragged and bell shaped holes at the top so that subsequent plugging of the hole by concrete cannot be accomplished in a satisfactory manner with respect to the surface of the concrete pavement. Accordingly, by means of the drilling apparatus of this invention an enlarged circular hole is drilled to a limited depth by means of a rotary core drill arranged concentric with the axis of the pneumatic rock drill so as to produce a sharp shouldered top portion to the hole drilled through the concrete. As a result of such starting hole near the top of the concrete pavement, the entire hole may be refilled with concrete in a satisfactory manner with the concrete plug near the top surface of the pavement adhering in a more satisfactory manner and presenting a more pleasing appearance.

It is therefore the primary object of this invention to provide a drilling apparatus incorporating both a pneumatic type of rock drill and concentrically disposed diamond core drill, arranged to bore an enlarged starting hole of limited depth prior to the drilling of the hole through the concrete pavement by the pneumatic rock drill.

Another object of this invention is to provide a drilling apparatus performing the above noted functions, which apparatus is conveniently mounted on a lateral side of a tractor vehicle with the drilling apparatus selectively positioned for performing its operation by use of the front end loader bucket mechanism mounted on the tractor vehicle.

A further object of this invention in accordance with the foregoing objects is to provide drilling apparatus which initially starts a hole by use of a rotary core drill and subsequently completes the hole with a concentric rock drill in a single centered set-up.

These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout, and in which:

FIGURE 1 is a side elevational view of a tractor vehicle having a front loader bucket mechanism and the drilling apparatus of this invention mounted thereon, the drilling apparatus being illustrated in its transport position.

FIGURE 2 is a side elevational view similar to FIG- 3,113,626 Patented Dec. 10, 1963 "ice URE 1 but illustrating the drilling apparatus in operating position.

FIGURE 3 is an enlarged elevational view of the drilling apparatus itself.

FIGURE 4 is a sectional view taken through a plane indicated by section line 44 in FIGURE 3.

FIGURE 5 is an operational view of the core drill bit drilling the top enlarged starting bore.

FIGURE 6 is an operational view illustrating the rock drill bit drilling a hole concentric to the starting bore.

FIGURE 7 is an operational view of the rock drill bit having completed the drilling of the hole through the concrete pavement.

FIGURE 8 is a sectional view taken substantially through the plane indicated by the line 88 of FIG- URE 4.

Referring now to the drawings in detail, FIGURE 3 illustrates the drilling apparatus generally indicated by reference numeral 10. In FIGURES 1 and 2, the drilling apparatus It) is illustrated in its environment pursuant to the invention and is accordingly mounted on a tractor vehicle generally indicated by reference numeral 12 on one lateral side thereof between the front and rear wheels. Also mounted on the tractor vehicle 12 is a front loading bucket mechanism generally indicated by reference numeral 14 which is actuated in cooperation with the drill ing apparatus 10 for purposes of positioning the drilling apparatus 10 between its transport position illustrated in FIGURE 1 and its operating position as illustrated in FIGURE 2.

Referring now to FIGURE 3, it will be observed that a mounting frame member 16 is provided for the purpose of mounting the drilling apparatus 10 on the tractor vehicle 12. Accordingly, the frame member 16 is rigidly attached to the vehicle 12.

A pneumatic rock drill carriage 13 is provided and slidably mounted on the frame member 16 for vertical movement therealong. The carriage 18 mounts a pneumatically operated cylinder mechanism 20 of conventional design for operating a rock drill bit 22 which extends downwardly therefrom. The pneumatic cylinder mechanism 29 is energized from a source of power on the tractor vehicle connected thereto by connection 24. Mounted adjacent the top end of the frame 16 is an idler pulley wheel 26 about which a cable 28 is trained, which cable is connected at one end to a top connecting portion 30 of the carriage 18 for the purpose of raising and lowering the carriage and hence the rock drill mechanism 20 and rock drill bit 22 into or out of contact with the concrete pavement.

Referring now to FIGURES 1 and 2, it will be observed that the cable 28 is connected to an upper edge of a front loading bucket 32 by means of a second cable 34 and a spring element 36. The front loading bucket 32 is therefore yieldably connected to the pneumatic drill carriage.

The front bucket loading mechanism 14 is of conventional design and includes a lift arm 38 which may be selectively controlled for operation of the bucket 32 by means of the selectively operated hydraulic cylinder mechanism 40. However, when the front loading bucket 32 is not being operated for its primary purpose, the lift arm 38 thereof will be held in a fixed position by means of a lift arm stabilizer 42, the hydraulic mechanism 40 then being inoperative. However, the loading bucket mechanism 14- is operative to the extent necessary to position the carriage 18 of the rock drill mechanism 20 in its transport position of FIGURE 1 or its operating position of FIGURE 2. Accordingly, the front loading bucket mechanism 14 includes a hydraulic bucket control mechanism 44 by means of which the tiltable position of the bucket 32 on its mounting lift arm 38 is controlled.

Accordingly, when the control mechanism 44 is in its extended position as illustrated in FIGURE 1, the bucket 32 has been pivoted forwardly with respect to the lift arm 38 to maintain the cable 28 in taut conditionwhereby the carriage 18 for the rock drill 2b is raised above the ground so that the drilling apparatus maybe out of operative position. When the bucket control mechanism 14 is actuated to its retracted position as illustrated in FIGURE 2, the bucket 32 will be pivoted rearwardly on its lift arm 38 so as to slacken the cable 28 a suflicient amount to lower the rock drill bit 22 into contact with the concrete pavement 46 and also permit the drill bit 22 to drill therethrough as seen in FIGURE 2.

From FIGURE 2, it will be observed that the hole drilled through the concrete pavement 46 includes a top bore 48 of larger diameter than the smaller diameter bore portion 59. Referring therefore to FIGURES 5, 6 and 7 it will be observed that the top bore is cut by means of the diamond core drill bit 52 for producing the enlarged core portion 48 of a limited depth. It will be appreciated that to completely drill the hole by means of the rotary type core drill 52 would be unduly expensive. Accordingly, the remainder of the hole 50 may be drilled in the conventional and cheaper manner by means of the pneumatic rock drill bit 22.

Referring now to FIGURES 3, 4, and 8 it will be observed that sliclably mounted on the frame 16 adjacent the bottom thereof is a core drill bracket or carriage 54. The core drill carriage 54 may be selectively positioned between its retracted position as illustrated by solid line in FIGURE 2, and its operative position as illustrated by dotted line in FIGURE 2 for the purpose of drilling the top bore 48 as illustrated in FIGURE 5. Accordingly a hydraulic cylinder mechanism 56 is pivotally connected to an extension 58 from the frame 16, said mechanism 56 being operatively connected by means of. piston rod 60 to the core drill carriage 54 by means of pivot bracket 62. The core drill 52 may thereby be lowered into contact with the concrete pavement 46 for drilling the top bore 48 and subsequently raised out of contact while the pneumatic rockdrili bit 22 which extends concentrically through the core drill 52 may complete the hole portion 50.

The core drill bit 52 is therefore rotatably mounted in the core drill carriage 54 by means of a pair of bearing brackets 64. e The core drill bit 52 is rotatably driven by means of an air motor 66 mounted on an extended portion of the core drill carriage 54 and drivingly connected to the core drill bit 52 between the bearing brackets 64 by means of the chain belt drive 68 drivingly connected to a sprocket 57 keyed to the core drill bit 52, for example. The air motor 66 is suitably energized and controlled from the tractor vehicle 12 by the connection 70 thereto. g e 7 From the foregoing description, operation and utility of the drilling apparatus and control mechanism therefor will be apparent. It will therefore be appreciated that the pneumatic rock drill mechanism will engage the concrete pavement for drilling therethrough with the requisite pressure in view of the weight of carriage 18 and the slack condition of the cable 28. With regard to the core drill operation, it will be appreciated that the requisite drilling pressure may be applied thereto by the hydraulic ram mechanism 56 which lowers the core drill carriage 54 into operative position. As a result of the foregoing apparatus, the rock drill and core drill will be permanently disposed concentrically to each other and retractable for sequential operation as hereinbefore indicated. Accordingly a starting hole may be bored cen- 4 tered with the remaining portion of the hole by one operation for a particular and advantageous purpose.

The foregoing is considered as illustrative only of the principles of the invention; Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope of the invention as claimed.

What is claimed as new is as follows:

1. In combination with a tractor vehicle having a lift arm mounting a front end loader bucket hydraulically actuated between an up and down position, a rock drill mechanism attached to one lateral side of the tractor vehicle comprising vertically movable carriage means slidably mounted on the tractor vehicle, cable means yieldably connecting said carriage means to said front end loader bucket for lowering the carriage means by actuation of the bucket to a position to slacken said cable means, a pneumatic operating means mounted on the carriage means, and a rock drill bit extending downwardly therefrom and actuated by the pneumatic operating means when the carriage means is in lowered position, core drill means having a core drill bit slidably mounted on the tractor vehicle and concentrically disposed about said rock drill bit, means for selectively lowering or raising the core drill means relative to the carriage means, and power means for separately rotating said core drill means, said core drill means comprising a core drill bracket slidable on the tractor vehicle, hydraulic means operatively connected to the core drill bracket for lowering or raising the core drill bit and bracket, means rotatabl'y mounting said bit on said bracket in concentric relation to the rock drill bit extending therethrough and said power means comprising motor means mounted on the bracket and drivingly connected to the core drill bit for operation thereof.

2. In combination with a pneumatic rock drill mechanism including a rock drill bit mounted on a rock drill carriage, a vertical member, means sliclably mounting said carriage on the vertical member, means for lowering the drill mechanism and its rock drill bit into contact with a concrete surface, rotary core drill means comprising a rotary core drill bit disposed about said rock drill bit extensible therethrough for boring an enlarged starting hole in the concrete surface prior to drilling by the rock drill bit to produce a sharp shouldered opening at the top of the hole bored through the concrete by the rock drill bit, a core drill bracket slidable relative to the vertical member and rotatably mounting the core drill bit in concentric relation to the rock drill bit extending therethrough, hydraulic means operatively connected to the core drill bracket for lowering or raising the core drill bit and motor means mounted on the bracket and drivingly connected to the core drill bit for operation thereof.

References Cited in the file of this patent UNITED STATES PATENTS 699,122 Warner Apr. 29, 1902 2,165,666 Tilly July 11, 1939 2,292,867 Charles Aug. 11, 1942 2,705,612 Walker Apr. 5, 1955 2,969,844 Hamrick Jan. 31, 1961 2,995,197 Hlavka Aug. 8, 1961 3,026,948 Pettee Mar. 27, 1962 3,044,562 Crampton July 17, 1962 

2. IN COMBINATION WITH A PNEUMATIC ROCK DRILL MECHANISM INCLUDING A ROCK DRILL BIT MOUNTED ON A ROCK DRILL CARRIAGE, A VERTICAL MEMBER, MEANS SLIDABLY MOUNTING SAID CARRIAGE ON THE VERTICAL MEMBER, MEANS FOR LOWERING THE DRILL MECHANISM AND ITS ROCK DRILL BIT INTO CONTACT WITH A CONCRETE SURFACE, ROTARY CORE DRILL MEANS COMPRISING A ROTARY CORE DRILL BIT DISPOSED ABOUT SAID ROCK DRILL BIT EXTENSIBLE THERETHROUGH FOR BORING AN ENLARGED STARTING HOLE IN THE CONCRETE SURFACE PRIOR TO DRILLING BY THE ROCK DRILL BIT TO PRODUCE A SHARP SHOULDERED OPENING AT THE TOP OF THE HOLE BORED THROUGH THE CONCRETE BY THE ROCK DRILL BIT, A CORE DRILL BRACKET SLIDABLE RELATIVE TO THE VERTICAL MEMBER AND ROTATABLY MOUNTING THE CORE DRILL BIT IN CONCENTRIC RELATION TO THE ROCK DRILL BIT EXTENDING THERETHROUGH, HYDRAULIC MEANS OPERATIVELY CONNECTED TO THE CORE DRILL BRACKET FOR LOWERING OR RAISING THE CORE DRILL BIT AND MOTOR MEANS MOUNTED ON THE BRACKET AND DRIVINGLY CONNECTED TO THE CORE DRILL BIT FOR OPERATION THEREOF. 